ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1/CH4N2O/c2-1(3)4/h(H4,2,3,4)/f/h2-3H2/file?format=sdf&get3d=True  -- InChI=1/CH4N2O/c2-1(3)4/h(H4,2,3,4)/f/h2-3H2 could not be loaded.